Lol climate controlled... haha!
basements should be good! the floor is always nice and cold!
I was also thinking if you staple it to plywood you could use a dremel and take out small chunks of the pywood and then paint them!! Tadaaa... Pot holes! Put them near the edges of your track where "track maintnance" is less worried about (but you know you or others might end up driving)
Realism is cool!